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Pre-wet Curtain Coat Process

IP.com Disclosure Number: IPCOM000121536D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

Shirai, M: AUTHOR

Abstract

Disclosed is a curtain coat process in which a pre-wet step is added to prevent formation of voids.

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This is the abbreviated version, containing approximately 100% of the total text.

Pre-wet Curtain Coat Process

      Disclosed is a curtain coat process in which a pre-wet
step is added to prevent formation of voids.

      Curtain coating is widely used for deposition of polymer films
on circuit boards.  However, curtain coating on the surface with
circuit lines causes many air traps at the edges of the circuit lines
and the trapped air forms voids.

      To avoid the air traps, thinner or diluted coating material is
applied to the surface of the work or board before curtain coating.
Viscosity of the thinner or diluted coating material is selected
sufficiently low not to cause air traps.

      After the pre-wet step, a desired coating material such as
insulating resin is flowed down onto the pre-wetted surface from the
curtain coater. The coating material wets well the pre-wetted surface
due to similar surface tension and prevents occurrence of air traps.